I did an exact number of lessons every day, though over time that number increased. I had my lessons set in batches of six, and I usually did 12-18 in the morning at a time that I would be sure to hit the first two review intervals throughout the day. Later on, I would do 12 in the morning, and another 6-12 in the evening, at a time that I would hit the +4h interval before bed, and the +8h interval when I woke up.
I also limited my apprentice count to 100-120 max. A very steady number of reviews every day, to keep coasting in that rhythm, and not have times where I had to do a lot more than other days. I could spend a samey, predicatble amount of time on WK every day, which helped my consistency.
If you always level up in the exact same amount of days, doing bulk lessons means all those session start stacking on the same days. I’m not saying it’s wrong, and it works for some people, but doing WK every day for a year+ gets very grating even for the most motivated and dedicated people. If I had been in a period of lower motivation and suddenly have a day with 700 reviews, I wouldn’t have had the patience (or time) to devote to getting it done properly. I would have either ended up rushing, or not finished off my reviews for the day. I always went to bed with zero reviews.